Grayson Rigdon was the best player in Texas six-man high school football for the past three years. For his senior season, the running back decided to make the leap from the scaled-down game played at small schools around the state to the eleven-man game. So he transferred to Columbus High School, about 75 miles west of Houston, joined the Cardinals’ football team this fall, and helped lead the school to a class 3A Division I state championship while rushing for more than two thousand yards on the season.That put the five-foot-eleven, 185-pound Rigdon, who is nineteen, in position to do what few six-man football players from Texas have ever done—earn a scholarship to play Division I college football. By the end of his season in…